The goal of this course is to introduce the student to the fundamental principles of heat transfer via conduction, convection and radiation and to familiarize him/her with basic calculations towards the prediction of heat transfer rates in the framework of the laws of thermodynamics.

• Setting up of energy balances for closed systems and control volumes. Conservation of thermal energy in the context of the first law of thermodynamics
• Presentation of the three mechanisms for heat transfer, i.e. conduction convection and radiation, and identification of the relevant physical properties – Fourier, Newton and Stefan‐Boltzmann laws ‐ Solution of simple model cases associated with practical applications
• One dimensional heat conduction in cartesian, cylindrical and spherical coordinates – Critical radius of insulation ‐ Solution of multilayered structures and thermal resistance networks using the analogy with electric circuits – Heat transfer from finned surfaces – Efficiency, effectiveness and the proper length of fins – Bioheat transfer equation
• Two dimensional heat conduction for the calculation of thermal shape factor in different geometries using mathematical methods from potential theory and the method of separation of variables in different coordinate systems
• Transient heat conduction in lumped, one two and three dimensional systems – Solution for finite and semi‐infinite solids using the methods of separation of variables and Laplace transform
• Convection heat transfer – Concept of boundary layer in fluid flows – Thermal boundary layer – Solution of coupled laminar heat and momentum transfer past a flat plate and the concept of analogy between heat and momentum transfer – Reynolds and Peclet numbers ‐ Friction factor and the Nusselt number
• Heat and momentum transfer in turbulent flow – Heat transfer via external and internal forced convection – Drag and heat transfer in external flow – Laminar and turbulent flow and heat transfer in tubes – Application in the design of heat exchangers
• Physical mechanism of natural convection – Equation of motion and the Grashof number‐ Natural convection over finned surfaces and inside enclosures

There are no prerequisite courses. It is recommended that students who are interested in attending the course have completed successfully the following courses:

• ΕΝ0101 THERMODYNAMICS  I
• ΓΕ0103 ORDINARY DIFFERENTIAL EQUATIONS
• ΕΝ0112 THERMODYNAMICS II
• ΕΝ0201 FLUID MECHANICS I

Suggested Literature:

• Υ.C. Cengel, Μεταφορά Θερμότητας ‐ Μια Πρακτική Προσέγγιση, Εκδ. Τζιόλα, 2005.
• F.P. Incropera and D. DeWitt, Fundamentals of Heat and Mass Transfer, John Wiley & Sons, 5th Ed. 2002
• Holman J.P., “Heat Transfer”, 8th Ed., McGraw Hill, 1997
• Ν. Σ. Μουσιόπουλος, “Εισαγωγή στην Μετάδοση Θερμότητας”, Γιαχούδη ‐ Γιαπούλη, Θεσ/νίκη, 1991
• Κ. Ρακόπουλος, “Μεταφορά Θερμότητας & Μάζας”, Πλαίσιο, 1985
• White F. M. “Heat and Mass Transfer”, Wesley, 1991
• R.W. Serth, Process Heat Transfer: Principles and Applications, Elsevier, 2007
• H.S. Carslaw and J.C. Jaeger, Conduction of Heat in Solids, Oxford University Press, 1959
• J. Crank, The Mathematics of Diffusion, Oxford University Press, 1976

Related academic journal:

•  Int. J. Heat and Fluid Flow
• Int. J. Heat and Mass Transfer
• Numerical Heat Transfer A,B
• ASME J. Heat Transfer
• Heat Transfer Engineering

Greek

Lectures